package cn.wyl.org.service.impl;

import cn.wyl.basic.service.impl.BaseServiceImpl;
import cn.wyl.basic.util.PageList;
import cn.wyl.org.domain.Department;
import cn.wyl.org.mapper.DepartmentMapper;
import cn.wyl.org.query.DepartmentQuery;
import cn.wyl.org.service.DepartmentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
public class DepartmentServiceImpl extends BaseServiceImpl<Department> implements DepartmentService {
    @Autowired
    private DepartmentMapper mapper;

    @Transactional//默认只读为false，默认传播机制为REQUIRED[有且仅有一个事务]
    @Override
    public void save(Department department) {
        mapper.save(department);
        update(department);
    }

    @Transactional
    @Override
    public void update(Department department) {
        // 取出父级部门id
        Long parent_id = department.getParent_id();
        // 父级部门id为Null（没有父级部门），设置DirPath为 /id
        if (parent_id==null){
            department.setDirPath("/"+department.getId());
        }else {
            // 有父级部门,设置DirPath为  父级部门的DirPath+/id
            Department parent_department = mapper.loadById(parent_id);
            String parent_dirPath = parent_department.getDirPath();
            department.setDirPath(parent_dirPath+"/"+department.getId());
        }
        // 重新设置department的DirPath
        mapper.update(department);
    }


    @Override
    public List<Department> deptTree() {
        //1. 一次性查询出所有数据，放到内存中，可以使用map
//        2. 从所有数据中找出第一层级/顶级部门：这就是我们需要返回的数据
//        3. 遍历所有部门只要不是第一层级的，找自己的上级，并将自己放入上级的children中
        //将所有的部门撞到map中  - 每次获取父部门都从这里获取
        List<Department> all = mapper.loadAll();
        Map<Long,Department> map  = new HashMap<>();
        for (Department department : all) {
            map.put(department.getId(),department);
        }

        //前端需要得到的集合数据 - 部门树
        List<Department> deptTree = new ArrayList<>();
        for (Department department:all){
            if(department.getParent_id() == null){//顶级部门
                deptTree.add(department);
            }else{//不是顶级部门
                //1.想办法找到当前部门的 父部门
                Long parent_id = department.getParent_id();
                //这种从数据库查询的方式，每次通过id去查询 - 查询出来映射给实体domain，children集合中都会是空集合 - 没有任何数据
                //Department parentDepartment = departmentMapper.loadById(parent_id);
                //下面这种是从Map中去获取的 - 以前装进去的对象还是会存在
                Department parentDepartment = map.get(parent_id);
                //2.将自己装到  父部门 的children中
                parentDepartment.getChildren().add(department);
            }
        }
        return deptTree;

    }
}
